/Engine/Source/Runtime/Core/Public/Math/Quat.h
Given start and end quaternions of quat1 and quat2, and tangents at those points tang1 and tang2, calculate the point at Alpha (between 0 and 1) between them. Result is normalized. This will correct alignment by ensuring that the shortest path is taken.
static [TQuat](API\Runtime\Core\Math\TQuat)< T > Squad ( const [TQuat](API\Runtime\Core\Math\TQuat)< T > & quat1, const [TQuat](API\Runtime\Core\Math\TQuat)< T > & tang1, const [TQuat](API\Runtime\Core\Math\TQuat)< T > & quat2, const [TQuat](API\Runtime\Core\Math\TQuat)< T > & tang2, T Alpha )